Camille de vleeschotjwer



C. DE VLEESCHOUWER 'UToMATIc DOOR LATCHING DEVICE Filed Nov. a, 1925 C lcle Ween/mayer Patented oci. ,25, 192?.

' its AUTOMATIC DOORLLATCHING nEvIoE. l

Application'ledV November 2, 1925, Serial No. 66,357, and inGermany November 6, 1924.

Automatic door latching devices arel known especially for double doors, whereby one door being closed, the second door bolts the first door, when said second door is closed. 1

It is known to provide the door which is first to' be closed with a bolting devicein such a manner that when closing the second door, the'iirst door is bolted by means of a pin extending from the 'first door, which is turned V.by the second door when this door is closed. The pin then transfers its movement to a spring pressed bolt. lIn these known devicesy said pin is directly and rigidly connected to the bolt and protrudes through an inclined slot. The door bea-ring the latching s so that the door is not bolted.

ldevice being closed, the pin'extends inthe path of the second doorv which when closed forces the pin up through the inclined slot,,

whereby the first mentioned door is bolted. The pin moving through the inclined slot, which must have a high pitch, meets with a considerable friction which very soon wears the slot so that th-e friction is still increased, 2 and at length the door instead of moving the pin, sometimes assumes an inclined posit-ion According to the invention the transmission of the movement of the pin tothe boltl is such 'that but vlittle friction occurs.` The pin is therefore connected to a b-ellcrank lever pivoted at the frontside of the casing l of the latching device, whilst the bolt is connected` by means of a connecting link with the bell crank lever. The bolt is guided in' two eyesy or lugs'arranged in the casing so that any stress exert-ed onthe bolt-is trans-y ferred to the eyes andV not to the othermechanism of the latching device. y y f A mode of carrying the invention into effect is illustratedv` in the .accompanying drawings, in which i s Figl is a rear 4view of thedevice with in-y wardly drawn bolt,

. Fig.V 2 is a similar view asillustrated in. VAFigpl but with the bolt extended, and

Fig. 3 is a side view ofthe device.l

s Ina rectangularly bent stripV of metall the boltv2 is shiftably arranged,'thefront end of the bolt being guided in an eyev inthe Vpart 3 of the strip, and the rear end ofthev crank lever protrudes through a slot 8 inthe front wall ofthe metal strip l.y

Thev boltfis'connected bymeans of a coni necting link 9' to the bell crank lever at the point 10.

The bell "crank of a spiral spring l1l to the corner piece 4.. The position ofthe pivot l0 `isso chosen with relation to thepivot pin'6, that ywhen the bell crank lever is moved by means of the pin -7, they force is transmitted in aos favourablev manner tothe bolt. Itis obvious that but very small frictional, resistances occur even when the pivots 4are not lgreased which is generally the case in such devices.

` What I claim is: 4

1. Av door latching device including an angle attaching plate adapted to be secured to the corner.` of a door and lhaving abolt` opening in one portion thereof, the other .portion being provided pwith acurved slot 75v opening at oneside edge "thereof, a bolt --slot upon the closing ofthe door to leffect a projection of thebolt,and means for retracting`V the vbolt lupon the opening of the door; Y v

Y 2. A door latching device as claimed in claim 1, wherein a `link ispivoted at one end i to the bellcrank lever and at the opposite .end tothe bolt so as to formfthe'o'perative f 'connection therebetween, and wherein-sl the means V for retracting the bolt includesl coiled spring having onev end connected' to th-e Lbell crank lever .adjacentv thef` point yof v Y connection of the link and its opposite yend Y`connectedtothe plate, substantially las and p for Vthe purposes set forth. Y o

In testimony whereofv I'afix my signature.

[CAMILLE.Da :vLEEsoHoUwEE l.

lever is"connectejdbymeans oo I 

